Changelog for haskell-src-1.0.3.0

1.0.3.0

Add support for MonadFail & Semigroup proposals by adding respective instances for P and Lex.
Drop support for GHC versions prior to GHC 7.0.
Remove -O2 from ghc-options.

Add support for GHC 7.10 & base-4.8)
Add missing Functor & Applicative instances for P and Lex monads needed for AMP compatibility.